Since the front door is locked,why not _____at the back door?Someone ,ight come out and answer it.A.to try knocking B.trying to knock C.to try and knock D.try knocking

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Since the front door is locked,why not _____at the back door?Someone ,ight come out and answer it.
A.to try knocking B.trying to knock C.to try and knock D.try knocking

D
why not do